Cap for writing instrument



FIG. 1 is a perspective view of a cap for a writing instrument showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a right side elevational view; and,

FIG. 6 is a top plan view. 

The ornamental design for a cap for writing instrument, as shown. 